More intuitive Apparition fail message for caster, update Glow description/resources, lower Glow cost to 10 mana from 15. Fix guild disband error, stop characters gaining defense from hitpoints over 150.

Spell fails due to too many monsters in room, but this wasn't reflected in the fail message.

Updated resources and spell description for Glow, and lowered the mana cost to 10 mana from 15 mana (level one spell).